Cutter blade for a rotary cutter
First Claim
1. A cutter blade for a rotary cutter which is formed of an elongated flat bar having a substantially parallel longitudinal side edges and defining a longitudinal axis midway between and parallel to said side edges, the flat bar being formed to define a mounting section adjacent one end thereof that can be rotatably mounted on a blade carrier of a rotary cutter, a cutting section adjacent the other end thereof that defines a sharpened cutting edge along one of its side edges, and an intermediate section that links the mounting section to the cutting section and that is cranked to offset the plane of the cutting section with respect to the plane of the mounting section, the side edge portion of the flat bar that is formed to define the cutting edge being curved operatively rearwardly with respect to a straight line defined by the remainder of the side edge of the flat bar including the said side edge portion, the curvature of the side edge portion defining the cutting edge being such that the line defining the cutting edge defines an arc of a circle with the centre of the circle being defined along a line dividing the cutting section and the intermediate section of the flat bar and which is perpendicular to the longitudinal axis of the straight section of the flat bar along the mounting section and the intermediate section, the ratio of the radius of the circle and the length of the cutting section being between 2:
- 1 and 1.5;
1.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a cutter blade for use on a rotary cutter of the tractor drawn type. Rotary cutters of this type usually have three or four cutter blades rotatably mounted on a blade carrier that can be rotated to induce cutter blade rotation and thereby permit cutting of grass. The cutter blade of the invention has a curved cutting edge with the section including the cutting edge being off-set with respect to the section whereby the blade is mounted on its blade carrier. The use of such cutter blades on a rotary cutter improves cutting efficiency, provides for an increased blade life and reduces the power requirements of the rotary cutter with which the blades are associated.
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Citations
24 Claims
- 1. A cutter blade for a rotary cutter which is formed of an elongated flat bar having a substantially parallel longitudinal side edges and defining a longitudinal axis midway between and parallel to said side edges, the flat bar being formed to define a mounting section adjacent one end thereof that can be rotatably mounted on a blade carrier of a rotary cutter, a cutting section adjacent the other end thereof that defines a sharpened cutting edge along one of its side edges, and an intermediate section that links the mounting section to the cutting section and that is cranked to offset the plane of the cutting section with respect to the plane of the mounting section, the side edge portion of the flat bar that is formed to define the cutting edge being curved operatively rearwardly with respect to a straight line defined by the remainder of the side edge of the flat bar including the said side edge portion, the curvature of the side edge portion defining the cutting edge being such that the line defining the cutting edge defines an arc of a circle with the centre of the circle being defined along a line dividing the cutting section and the intermediate section of the flat bar and which is perpendicular to the longitudinal axis of the straight section of the flat bar along the mounting section and the intermediate section, the ratio of the radius of the circle and the length of the cutting section being between 2:
- 13. A rotary cutter for cutting grass, and like matter, which comprises a body that can be hitched to a tractor, a blade carrier mounted on the body for rotation about an operatively vertical axis, connector means for connecting the blade carrier to the power-take-off of a tractor to be rotatable thereby, and a plurality of cutter blades mounted for free rotation on the blade carrier, each cutter blade being formed of an elongated flat bar having substantially parallel, longitudinal side edges and defining a longitudinal axis mid-way between and parallel to the side edges, the flat bar being formed to define a mounting section adjacent one end thereof where the flat bar is rotatably mounted on the blade carrier, a cutting section adjacent the other end thereof that defines a sharpened cutting edge along one of its side edges, and an intermediate section that links the mounting section to the cutting section and that is cranked to off-set the plane of the cutting section with respect to the plane of the mounting section, the side edge portion of the flat bar that is formed to define the cutting edge being curved operatively rearwardly with respect to a straight line defined by the remainder of the side edge of the flat bar including the said side edge portion, the curvature of the side edge portion defining the cutting edge being such that the line defining the cutting edge defines an arc of a circle with the centre of the circle being defined along a line dividing the cutting section and the intermediate section of the flat bar and which is perpendicular to the longitudinal axis of the straight section of the flat bar along the mounting section and the intermediate section, the ratio of the radius of the circle and the length of the cutting section being between 2:
Specification